refactor: Antigravity/Codex 服务重构为插件化适配器架构

- 将 Antigravity 和 Codex 从独立模块迁移至 src/services/provider/adapters/ 插件体系
- 新增 provider_types 和 oauth_token 模块，移除 maintenance_scheduler 中的 OAuth 定时刷新
- 增强 admin API：扩展 keys 和 provider_query 端点，新增 dashboard 路由
- 大幅增强 ProviderDetailDrawer 组件，新增 AntigravityQuotaDialog
- 改进 handler 基类（chat/cli）和错误分类器
- 优化 fetch_scheduler 和 upstream_fetcher
- 前端 UI 组件清理和优化
- 更新测试以匹配新模块结构

tests/services/antigravity/test_client.py

@@ -6,31 +6,154 @@ from unittest.mock import AsyncMock, patch
 import httpx
 import pytest
 
-from src.services.antigravity.client import load_code_assist
-from src.services.antigravity.constants import DAILY_BASE_URL, PROD_BASE_URL
+from src.services.provider.adapters.antigravity.client import (
+    fetch_available_models,
+    load_code_assist,
+    parse_retry_delay,
+)
+from src.services.provider.adapters.antigravity.constants import (
+    DAILY_BASE_URL,
+    PROD_BASE_URL,
+    SANDBOX_BASE_URL,
+)
+
+# ---------------------------------------------------------------------------
+# load_code_assist
+# ---------------------------------------------------------------------------
 
 
 @pytest.mark.asyncio
-async def test_load_code_assist_falls_back_to_daily() -> None:
-    resp1 = httpx.Response(500, json={"error": {"message": "boom"}})
-    resp2 = httpx.Response(200, json={"cloudaicompanionProject": "project-1"})
+async def test_load_code_assist_falls_back_on_500() -> None:
+    """500 时 fallback 到下一个 URL（Sandbox → Daily → Prod 顺序）。"""
+    resp_fail = httpx.Response(500, json={"error": {"message": "boom"}})
+    resp_ok = httpx.Response(200, json={"cloudaicompanionProject": "project-1"})
 
-    client = SimpleNamespace(post=AsyncMock(side_effect=[resp1, resp2]))
+    client = SimpleNamespace(post=AsyncMock(side_effect=[resp_fail, resp_ok]))
 
-    with patch(
-        "src.clients.http_client.HTTPClientPool.get_proxy_client",
-        AsyncMock(return_value=client),
+    with (
+        patch(
+            "src.clients.http_client.HTTPClientPool.get_proxy_client",
+            AsyncMock(return_value=client),
+        ),
+        patch(
+            "src.services.provider.adapters.antigravity.client.url_availability.get_ordered_urls",
+            return_value=[SANDBOX_BASE_URL, DAILY_BASE_URL, PROD_BASE_URL],
+        ),
     ):
         data = await load_code_assist("tok", proxy_config=None, timeout_seconds=1.0)
 
     assert data["cloudaicompanionProject"] == "project-1"
     assert client.post.await_count == 2
-    assert client.post.call_args_list[0].args[0] == f"{PROD_BASE_URL}/v1internal:loadCodeAssist"
+    assert client.post.call_args_list[0].args[0] == f"{SANDBOX_BASE_URL}/v1internal:loadCodeAssist"
     assert client.post.call_args_list[1].args[0] == f"{DAILY_BASE_URL}/v1internal:loadCodeAssist"
 
 
+@pytest.mark.asyncio
+async def test_load_code_assist_4xx_does_not_fallback() -> None:
+    """401/403 等 4xx 客户端错误不应 fallback，直接抛出。"""
+    resp_401 = httpx.Response(401, json={"error": "unauthorized"}, text="unauthorized")
+
+    client = SimpleNamespace(post=AsyncMock(return_value=resp_401))
+
+    with (
+        patch(
+            "src.clients.http_client.HTTPClientPool.get_proxy_client",
+            AsyncMock(return_value=client),
+        ),
+        patch(
+            "src.services.provider.adapters.antigravity.client.url_availability.get_ordered_urls",
+            return_value=[SANDBOX_BASE_URL, DAILY_BASE_URL],
+        ),
+        pytest.raises(RuntimeError, match="status=401"),
+    ):
+        await load_code_assist("tok", proxy_config=None, timeout_seconds=1.0)
+
+    # 只调用了一次（没有 fallback 到第二个 URL）
+    assert client.post.await_count == 1
+
+
 @pytest.mark.asyncio
 async def test_load_code_assist_requires_token() -> None:
     with pytest.raises(ValueError):
         await load_code_assist("", proxy_config=None)
 
+
+# ---------------------------------------------------------------------------
+# fetch_available_models
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_fetch_available_models_falls_back_on_500() -> None:
+    resp_fail = httpx.Response(500, json={"error": {"message": "boom"}})
+    resp_ok = httpx.Response(
+        200,
+        json={
+            "models": {
+                "claude-sonnet-4": {
+                    "displayName": "Claude Sonnet 4",
+                    "quotaInfo": {"remainingFraction": 0.75, "resetTime": "2024-01-15T12:00:00Z"},
+                }
+            }
+        },
+    )
+
+    client = SimpleNamespace(post=AsyncMock(side_effect=[resp_fail, resp_ok]))
+
+    with (
+        patch(
+            "src.clients.http_client.HTTPClientPool.get_proxy_client",
+            AsyncMock(return_value=client),
+        ),
+        patch(
+            "src.services.provider.adapters.antigravity.client.url_availability.get_ordered_urls",
+            return_value=[DAILY_BASE_URL, PROD_BASE_URL],
+        ),
+    ):
+        data = await fetch_available_models(
+            "tok",
+            project_id="project-1",
+            proxy_config=None,
+            timeout_seconds=1.0,
+        )
+
+    assert "models" in data
+    assert client.post.await_count == 2
+    assert (
+        client.post.call_args_list[0].args[0] == f"{DAILY_BASE_URL}/v1internal:fetchAvailableModels"
+    )
+    assert (
+        client.post.call_args_list[1].args[0] == f"{PROD_BASE_URL}/v1internal:fetchAvailableModels"
+    )
+
+
+@pytest.mark.asyncio
+async def test_fetch_available_models_requires_project_id() -> None:
+    with pytest.raises(ValueError):
+        await fetch_available_models("tok", project_id="", proxy_config=None)
+
+
+# ---------------------------------------------------------------------------
+# parse_retry_delay
+# ---------------------------------------------------------------------------
+
+
+def test_parse_retry_delay_from_retry_info() -> None:
+    error_json = '{"error": {"details": [{"@type": "type.googleapis.com/google.rpc.RetryInfo", "retryDelay": "1.5s"}]}}'
+    delay = parse_retry_delay(error_json)
+    assert delay is not None
+    # 1500ms + 200ms buffer = 1700ms = 1.7s
+    assert 1.5 < delay < 2.0
+
+
+def test_parse_retry_delay_from_quota_reset() -> None:
+    error_json = '{"error": {"details": [{"metadata": {"quotaResetDelay": "200ms"}}]}}'
+    delay = parse_retry_delay(error_json)
+    assert delay is not None
+    assert 0.3 < delay < 0.5
+
+
+def test_parse_retry_delay_invalid() -> None:
+    assert parse_retry_delay("not json") is None
+    assert parse_retry_delay("{}") is None
+    assert parse_retry_delay('{"error": {}}') is None